Add additional log statements

What does this MR do and why?

This allows us to track when a pipeline or build hooks worker was enqueued, which is helpful in tracing customer issues.

There are no user-visible changes.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.